When an unusual problem does not occur often enough to permit a large number of observations, it might be studied using a(n):

Question

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Case studies are often used when studying rare or unusual problems, as they involve in-depth analysis of a single individual or a small group of individuals. This allows researchers to gather detailed information and gain insights into the problem, even when there is not enough data to conduct a larger-scale study. A, B, and D are not the best choices, as they may require a larger sample size or a different approach to study an unusual problem.

When an Unusual Problem Does Not Occur Often Enough to Permit